Hadriel Kaplan wrote: > I wonder if we really need the from-tag at all for this type of thing. > Forget for the moment about any of this and just think of the current Call-ID > and tags, and assume there were no B2BUA's. Is there ever a case where a UAC > would generate a request with the same Call-ID as a previous request, but a > different from-tag?
Registration, but I think that is probably out of scope for what you are considering! > The to-tag we needed to identify forked responders generating unique > early-dialogs with a common Call-ID, but why did we need the UAC to generate > a from-tag? (I'm feeling dumb that I can't figure out the answer) > In the reverse direction, the presence of a to-tag in a request indicates an in-dialog request. Therefore, requiring a from-tag ensures that requests in the reverse direction can have a to-tag, and thus be correctly treated as in-dialog. > -hadriel > Michael _______________________________________________ Sip mailing list https://www.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use [email protected] for questions on current sip Use [email protected] for new developments on the application of sip
